<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2017/12/22
  Time: 9:05
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<script type="text/javascript" src="/js/jquery/jquery.min.js"></script>
<body>
<form id="form1" runat="server">
    <div>
        输入密码:<input ID="TextBox1" runat="server" onKeyUp=pwStrength(this.value) onBlur=pwStrength(this.value)><br/>
        密码强度:
        <table border="1" cellpadding="1" borderColorDark="#fdfeff" borderColorLight="#99ccff" cellspacing="1" style="width: 200px; display: inline; background-color:#e0f0ff">
            <tr>
                <td id="strength_L" style="width: 100px; height: 19px;" align="center">
                    弱</td>
                <td id="strength_M" style="width: 100px; height: 19px;" align="center">
                    中</td>
                <td id="strength_H" style="width: 100px; height: 19px;" align="center">
                    强</td>
            </tr>
        </table>
    </div>
</form>
</body>
</html>
<script language="javascript" type="text/javascript">
    //CharMode函数
    //测试某个字符是属于哪一类.
    function CharMode(iN){
        if (iN>=48 && iN <=57) //数字
            return 1;
        if (iN>=65 && iN <=90) //大写字母
            return 2;
        if (iN>=97 && iN <=122) //小写
            return 4;
        else
            return 8; //特殊字符
    }
    //bitTotal函数
    //计算出当前密码当中一共有多少种模式
    function bitTotal(num){
        modes=0;
        for (i=0;i<4;i++){
            if (num & 1) modes++;
            num>>>=1;
        }
        return modes;
    }
    //checkStrong函数
    //返回密码的强度级别
    function checkStrong(sPW){
        if (sPW.length<=4)
            return 0; //密码太短
        Modes=0;
        for (i=0;i<sPW.length;i++){
            //测试每一个字符的类别并统计一共有多少种模式.
            Modes|=CharMode(sPW.charCodeAt(i));
        }
        return bitTotal(Modes);
    }
    //pwStrength函数
    //当用户放开键盘或密码输入框失去焦点时,根据不同的级别显示不同的颜色
    function pwStrength(pwd){
        O_color="#e0f0ff";
        L_color="#FF0000";
        M_color="#FF9900";
        H_color="#33CC00";
        if (pwd==null||pwd==''){
            Lcolor=Mcolor=Hcolor=O_color;
        }
        else
        {
            S_level=checkStrong(pwd);
            switch(S_level)
            {
                case 0:
                    Lcolor=Mcolor=Hcolor=O_color;
                case 1:
                    Lcolor=L_color;
                    Mcolor=Hcolor=O_color;
                    break;
                case 2:
                    Lcolor=Mcolor=M_color;
                    Hcolor=O_color;
                    break;
                default:
                    Lcolor=Mcolor=Hcolor=H_color;
            }
        }
        document.getElementById("strength_L").style.background=Lcolor;
        document.getElementById("strength_M").style.background=Mcolor;
        document.getElementById("strength_H").style.background=Hcolor;
        return;
    }
</script>
